The reason I purchased a G11 is that I wanted a mount that would last for a long time....and I could buy any part I needed as a spare to keep it in tip top service.
1. Current G11 PE is around +/- 5 arc seconds PP (or better) out of the box. This was due to Losmandy changing to a newer High Precision Worm (HPW), around early/mid 2009 onwards. G11's prior to this had a little larger PE (on average) but this can be reduced by installing a HPW.
2. The new One Piece Worm (OPW) block allows better orthogonality and adjustment of the worm train and some users have reported PE as low as
+/- 2 arc seconds PE. I haven't upgraded to the OPW as my mount came with a PE of +/- 4 arc seconds and the errors were easily guided out. A lot of this depends on the scope used. Some scopes demand more of the mount (ie: a long refractor) and PE can be worse or better.
Since the OPW keeps the worm and bearings in alignment then the 76 second tick should reduce (
the tick is caused by worm tight spot caused by misaligned worm bearings).
3. The G11's come in 2 flavours of control systems: The Digital drive system (non-go-to), which uses a stepper motors (from
www.mechtex.com); and The Gemini2 (go-to) which uses
servo motors. You could purchase the Gemini system with higher torque Maxon servo motors although I don't see that on their website at the moment. I never felt the need for these but that's my opinion.
An answer without a question...get a G11 with Gemini2...IMHO
.
Hope this helps.